Add LookupTable class for finding classes and members by name.

pkg/kernel/lib/type_propagation/builder.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 library kernel.type_propagation.builder;
 
 import '../ast.dart';
 import '../class_hierarchy.dart';
 import '../core_types.dart';
 import 'canonicalizer.dart';
 import 'constraints.dart';
@@ skipping 218 matching lines @@
     streamNode = getExternalInstanceVariable(coreTypes.streamClass);
     functionValueNode = getExternalInstanceVariable(coreTypes.functionClass);
     nullNode = newVariable(null, 'Null');
 
     iteratorField = getPropertyField(Names.iterator);
     currentField = getPropertyField(Names.current);
 
     latticePointForAllFunctions =
         getLatticePointForSubtypesOfClass(coreTypes.functionClass);
 
-    identicalFunction = coreTypes.getCoreProcedure('dart:core', 'identical');
+    identicalFunction = coreTypes.getTopLevelMember('dart:core', 'identical');
 
     // Seed bitmasks for built-in values.
     constraints.addBitmaskInput(ValueBit.null_, nullNode);
     constraints.addBitmaskInput(ValueBit.all, dynamicNode);
 
     for (Library library in program.libraries) {
       for (Procedure procedure in library.procedures) {
         buildProcedure(null, procedure);
       }
       for (Field field in library.fields) {
@@ skipping 1718 matching lines @@
         environment.addStore(input, field, argument);
       }
     }
     for (int arity = minArity; arity <= maxArity; ++arity) {
       int returnLocation =
           environment.getLoad(input, fieldNames.getReturnField(arity));
       visitContravariant(node.returnType, returnLocation);
     }
   }
 }